Samsung fastlött LPDDR4X-4267 8×2 GB vs Samsung fastlött LPDDR5-6400 4×4 GB
Short answer: which is best?
Samsung fastlött LPDDR4X-4267 8×2 GB is 35.3 % stronger than Samsung fastlött LPDDR5-6400 4×4 GB. Samsung fastlött LPDDR4X-4267 8×2 GB ranks #33 of 42 measured memory kits at WhatFPS (6,425 RAM score over 1 verified runs). Samsung fastlött LPDDR5-6400 4×4 GB ranks #39 of 42 measured memory kits at WhatFPS (4,749 RAM score over 1 verified runs). The numbers are measured in 2 verified WhatFPS runs — not estimated, not self-reported.
Measured comparison
| Metric | Samsung fastlött LPDDR4X-4267 8×2 GB | Samsung fastlött LPDDR5-6400 4×4 GB |
|---|---|---|
| RAM score (the kit's own performance: bandwidth + latency) | 6,425 | 4,749 |
| Best rig (GAMING — whole PC) | 880 | 1,655 |
| Bandwidth, one thread | 24,519 MB/s | 12,377 MB/s |
| RAM latency (lower is better) | 158 ns | 146 ns |
| Rated speed | 4,267 MT/s | 6,400 MT/s |
| Runs at (seen, avg) | 4,267 MT/s | 6,400 MT/s |
| Capacity | 16 GB | 16 GB |
What the numbers mean
The RAM score is the kit's measured performance in the rigs it sat in — single-thread bandwidth and latency beyond L3. Platform, BIOS settings and whether XMP/EXPO was on all affect it. GAMING is the whole rig's score. We show both and never mix them.
All numbers come from our benchmark suite, the same test on every PC, written in Rust with no middleware. The methodology is open at https://whatfps.com/metodik
All measurements for Samsung fastlött LPDDR4X-4267 8×2 GB · All measurements for Samsung fastlött LPDDR5-6400 4×4 GB